#1F317B#1F317B

#1F317B is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.7% C 0.128 H 268.5°. Best body text is #FFFFFF at 11.77:1 contrast (WCAG AA passes).

Color values

HEX	#1F317B
RGB	rgb(31, 49, 123)
HSL	hsl(228, 60%, 30%)
HSV	hsv(228, 75%, 48%)
CMYK	cmyk(74.8%, 60.2%, 0%, 51.8%)
CIE-LAB	lab(23.40, 20.45, -44.26)
CIE-LCH	lch(23.40, 48.75, 294.80°)
OKLab	oklab(34.74% -0.0034 -0.1276)
OKLCH	oklch(34.74% 0.128 268.5)
XYZ	xyz(5.2373, 3.9175, 19.2152)
Luminance	0.0392 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F317B #7B691F

analogous

#1F5F7B #1F317B #3B1F7B

triadic

#1F317B #7B1F31 #317B1F

tetradic

#1F317B #7B1F5F #7B691F #1F7B3B

square

#1F317B #7B1F5F #7B691F #1F7B3B

split-complementary

#1F317B #7B3B1F #5F7B1F

monochromatic

#060A19 #131E4A #1F317B #2B44AC #4460D0

Accessibility & contrast

On white

11.77

#1F317B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1F317B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F317B

11.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F317B	#FFFFFF	#000000	##FFFFFF
##1F317B	1.00	11.77	1.78	11.77
#FFFFFF	11.77	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C7D

Deuteranopia (green-blind)

#00347A

Tritanopia (blue-blind)

#004351

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1f317b;
/* rgb */ color: rgb(31, 49, 123);
/* oklch */ color: oklch(34.7% 0.128 268.5);

Tailwind

colors: {
  custom: {
    50: '#6968a2',
    500: '#1f317b',
    950: '#000000',
  },
}

SCSS

$custom: #1f317b;
$custom-light: #6968a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f317b",
  "rgb": {
    "r": 31,
    "g": 49,
    "b": 123
  },
  "hsl": {
    "h": 228.261,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.3474,
    "c": 0.12768,
    "h": 268.5
  },
  "luminance": 0.03918
}

Semantic roles & 50–950 ramp

primary

#1F317B

secondary

#AE9A48

accent

#C445E3

background

#F6F6FA

surface

#ECEBF3

border

#C7C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F317B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →